WO2018148905A1 - 介质滤波器、收发设备及基站 - Google Patents
介质滤波器、收发设备及基站 Download PDFInfo
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- WO2018148905A1 WO2018148905A1 PCT/CN2017/073789 CN2017073789W WO2018148905A1 WO 2018148905 A1 WO2018148905 A1 WO 2018148905A1 CN 2017073789 W CN2017073789 W CN 2017073789W WO 2018148905 A1 WO2018148905 A1 WO 2018148905A1
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- hole
- dielectric filter
- dielectric
- resonant cavity
- ring
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
- H01P11/007—Manufacturing frequency-selective devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/2002—Dielectric waveguide filters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
- H01P1/2084—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with dielectric resonators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/212—Frequency-selective devices, e.g. filters suppressing or attenuating harmonic frequencies
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P11/00—Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type
- H01P11/001—Manufacturing waveguides or transmission lines of the waveguide type
- H01P11/006—Manufacturing dielectric waveguides
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/06—Cavity resonators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/10—Dielectric resonators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
Definitions
- the embodiments of the present invention relate to the field of filter technologies, and in particular, to a dielectric filter, a transceiver device, and a base station.
- the dielectric waveguide can greatly reduce the size of the product, and has the advantages of high Q value and small temperature drift, and is a good filter miniaturization solution.
- the dielectric filter In order to achieve the bandpass filtering effect, the dielectric filter needs to be designed to achieve high-side zero suppression and low-side zero suppression of the passband.
- the low-side zero of the filter passband can be generated by capacitive coupling to achieve low-side zero suppression outside the passband.
- the implementation of capacitive coupling is not as simple as the implementation of inductive coupling and requires special design.
- the capacitive coupling between the resonant cavities is realized by the combined structure of the through holes and the conductive layer partitioning (ie, the first blocking ring), and the difficulty of processing the through holes and the first blocking ring on the dielectric block is less than that of processing the specified depth on the dielectric block.
- the difficulty of the blind slot or the blind hole can be seen that the requirements of the dielectric filter of the embodiment of the present application are reduced, and the problem of precision control when processing blind slots or blind holes is avoided, in particular, the accuracy requirements are compared. High small high frequency filters also achieve high machining accuracy.
- the dielectric block has a slot on the partition that divides the dielectric block into at least three resonant cavities, the inner surface of the slot being covered with a metal layer.
- the slot is divided into at least three resonant cavities by slotting, the implementation of the slotting is simple, the processing difficulty is low, and the number of resonant cavities formed is at least three, which is beneficial to the use of the actual filtering scenario.
- the through hole is a circular through hole.
- the through hole is designed to be circular, which further reduces the difficulty of processing the dielectric filter.
- the through holes are polygonal through holes.
- the polygon may be various possible polygonal through holes such as a triangular through hole, a rectangular through hole, a pentagon through hole, and a hexagonal through hole.
- an embodiment of the present application provides a transceiver device, including: the foregoing media filter.
- the dielectric filter, the transceiver device and the base station of the embodiment of the present invention realize the capacitive coupling between the resonant cavities through the combined structure of the through holes and the conductive partition layer, and the structure of the capacitive coupling in the dielectric filter is simple, the processing difficulty is reduced, and the overcoming is overcome.
- the technical problem of the depth of blind slots or blind holes in the prior art is difficult to precisely control.
- FIG. 1 is a schematic structural diagram of a dielectric filter according to an embodiment of the present application.
- FIG. 4 is a schematic structural diagram of another dielectric filter according to an embodiment of the present application.
- Figure 6 is an equivalent circuit diagram of the dielectric filter shown in Figure 4.
- FIG. 7 is a schematic diagram of a band pass of a dielectric filter according to an embodiment of the present application.
- FIG. 8 is a schematic diagram of a low-end zero point adjustment curve of a dielectric filter according to an embodiment of the present application.
- Figure 11 is an equivalent circuit diagram of the dielectric filter shown in Figure 9;
- FIG. 12 is a schematic structural diagram of still another dielectric filter according to an embodiment of the present disclosure.
- REFERENCE SIGNS 1-first resonant cavity, 2-second resonant cavity, 3-third resonant cavity, 4-first slotted, 5-second slotted, 6-through hole, 7-first partition ring , 7a - outer edge of the first partition ring, 7b - inner edge of the first partition ring, 8-fourth cavity, 9 - second block ring, 10 - fifth cavity, 11 - sixth cavity, 12 - Microstrip feeder, 21-antenna, 22-medium filter, 23-switch, 24-signal transmit branch, 25-signal receive branch, 241-power amplifier, 251-low noise amplifier.
- FIG. 1 is a schematic structural diagram of a dielectric filter according to an embodiment of the present application.
- the dielectric filter includes a dielectric block having a surface covering metal layer, the dielectric block being made of a solid dielectric material.
- the metal layer covering the surface of the dielectric block is not marked.
- the surface of the structure shown in Fig. 1 is covered with a metal layer unless otherwise specified.
- the dielectric block shown in Figure 1 includes at least two resonant cavities.
- a slot may be provided on the dielectric block, and the dielectric block is divided into at least two resonant cavities by the slot.
- the inner surface of each slot is also covered with a metal layer.
- the two first slots 4 divide the dielectric block into two resonant cavities, namely a first resonant cavity 1 and a second resonant cavity 2.
- the first resonant cavity 1 and the second resonant cavity 2 are each equivalent to a circuit in which an inductor and a capacitor are coupled in parallel.
- the dielectric block shown in FIG. 1 also has a through hole 6 which is located between two adjacent resonant cavities, as shown in FIG.
- a through hole 6 is provided between the first resonant cavity 1 and the second resonant cavity 2, and an inner wall of the through hole 6 covers the metal layer.
- at least one opening surrounding the through hole 6 on the surface of the dielectric block has a first partition ring 7, and an area surrounded by the inner edge 7b of the first partition ring and the outer edge 7a of the first partition ring exposes the dielectric block.
- the center line of the first barrier ring 7 coincides with the axis of the through hole 6.
- the combination of the first barrier ring 7 and the through hole 6 is provided on the dielectric filter, structural discontinuity is generated, so that the electric field near the through hole 6 and the first barrier ring 7 is more concentrated.
- the electric energy can be stored.
- the combined structure of the first blocking ring 7 and the through hole 6 is equivalent to a capacitor for storing electric energy.
- the inner edge of the first barrier ring 7 and the edge of the opening of the through hole 6 may overlap.
- the inner edge of the first barrier ring 7 is spaced apart from the edge of the opening of the through hole 6.
- a first barrier ring 7 is provided on one open side of the through hole 6, and in an alternative embodiment, a first one may be provided on both open sides of the through hole 6. Breaking ring 7.
- the dielectric block has a first slot 4 and a second slot 5, and the inner surfaces of the first slot 4 and the second slot 5 also cover the metal layer.
- the first slot 4 and the second slot 5 divide the dielectric block into three resonant cavities. Specifically, the first slot 4 is used to partition the first resonant cavity 1 and the third resonant cavity 3, and the second slot 5 is used for the second slot 5 The first cavity 1 and the second cavity 2 are separated, and the second slot 5 is also used to separate the second cavity 2 and the third cavity 3.
- each cavity is equivalent to a circuit in which an inductor and a capacitor are coupled in parallel, and a narrow channel between two adjacent resonators is a window between the resonators, which is formed based on a window opening.
- the coupling between two adjacent resonant cavities is inductively coupled.
- a first path (solid line identification): a signal path of the first resonant cavity 1 - a second resonant cavity 2 - a third resonant cavity 3;
- a through hole is provided between the first resonant cavity 1 and the third resonant cavity 3.
- the inner wall of the through hole 6 is covered with a metal layer, and at least one opening surrounding the through hole on the surface of the dielectric block has a first partition ring 7, and the inner edge 7b of the first partition ring and the first partition The area enclosed by the outer edge 7a of the ring exposes the dielectric block.
- the inner edge 7b of the first barrier ring is spaced apart from the edge of the through hole 6.
- the center line of the first barrier ring 7 coincides with the axis of the through hole 6.
- the equivalent circuit of the dielectric filter shown in FIG. 4 is that, in the first path, the first resonant cavity 1, the second resonant cavity 2, and the third resonant cavity 3 are inductively coupled. In the two paths, the first resonant cavity 1 and the third resonant cavity 3 are capacitively coupled. Since the signals in the two paths are opposite in phase, the signals in the two paths cancel each other, thereby generating a low-end zero point of the band pass. inhibition.
- the dielectric filter shown in FIG. 4 forms a high-end zero point A of the pass band of the filter by inductive coupling, and forms a low-end zero point B of the pass band by capacitive coupling.
- the coupling amount of the capacitive coupling can be adjusted, thereby adjusting the position of the low end zero point of the filter pass band, wherein the diameter of the through hole 6 is
- the B1 point is the low-end zero position when the capacitive coupling amount is large
- B3 is the low-end zero position when the capacitive coupling amount is small
- the coupling amount is larger than the capacitive coupling between the two resonant cavities corresponding to the B3 point, and is smaller than the capacitive coupling between the two resonant cavities corresponding to the B1 point.
- the shape of the through hole 6 in the dielectric filter of the embodiment of the present application may be designed according to actual needs, for example, may be designed as a circular through hole 6 or as a polygonal through hole 6 , wherein the circular through hole is designed. 6 is simpler to process; it is designed as a polygonal through hole 6, and may be, for example, a triangular through hole 6, a rectangular through hole 6, a pentagon through hole 6, and a hexagonal through hole 6, and the like.
- the shape of the through hole 6 in the dielectric filter shown in FIG. 4 may be the same as or different from the shape of the first partition ring 7.
- the through hole 6 is a circular through hole
- the first blocking ring 7 is a square ring or an irregularly shaped partition ring.
- the specific shape and size of the first partition ring 7 can be adjusted according to the performance requirements of the dielectric filter, and is not specifically limited.
- a first barrier ring 7 is provided on one open side of the through hole 6, and in an alternative embodiment, a first one may be provided on both open sides of the through hole 6. Breaking ring 7.
- the medium block has two first slots 4 and one second slot 5, wherein the two first slots The inner surfaces of 4 and a second slot 5 are both covered with a metal layer.
- the two first slots 4 and one second slot 5 divide the dielectric block into four resonant cavities, specifically one of the slots for separating the first resonant cavity 1 and the fourth resonant cavity 8 and the other slotting
- the second slot 5 is for separating the first resonant cavity 1 and the second resonant cavity 2, and is also for separating the third resonant cavity 3 and the fourth resonant cavity 8 .
- each cavity is equivalent to a circuit in which an inductor and a capacitor are coupled in parallel, and a narrow channel between two adjacent resonators is a window between the resonators, which is formed by the window opening.
- the coupling between two adjacent resonant cavities is inductively coupled.
- a first path (solid line identification): a signal path of the first resonant cavity 1 - the second resonant cavity 2 - the third resonant cavity 3 - the fourth resonant cavity 8;
- the second path (marked by a broken line): the signal path of the first resonant cavity 1 - the fourth resonant cavity 8.
- adjacent resonant cavities form an inductive coupling between the adjacent resonant cavities
- the coupling between the first resonant cavity 1 and the fourth resonant cavity 8 in the second via is inductively coupled
- the input After the signals pass through the first resonant cavity 1 to the fourth resonant cavity 8, the phases of the two path signals are the same, and the signals are superimposed in phase without generating a zero point; when the first resonant cavity 1 and the fourth resonant cavity 8 in the second path are coupled
- the phases of the two path signals are opposite after the input signal passes through the first resonant cavity 1 to the fourth resonant cavity 8, and the signals of the two paths are cancelled, and a zero point can be generated.
- a through hole is provided between the first resonant cavity 1 and the fourth resonant cavity 8. 6.
- the inner wall of the through hole 6 is covered with a metal layer, and a first partition ring 7 is formed on the surface of the dielectric block around at least one opening side of the through hole 6, and the inner edge 7b of the first partition ring and the first partition The enclosed area of the outer edge 7a of the ring exposes the dielectric block.
- the inner edge 7b of the first barrier ring is spaced apart from the edge of the corresponding through hole 6.
- the combined structure of the through hole 6 and the partition ring forms a capacitive coupling between the first resonant cavity 1 and the fourth resonant cavity 8, and the equivalent circuit is a capacitive component.
- the equivalent circuit of the dielectric filter shown in FIG. 9 is such that, in the first path, between the first resonant cavity 1, the second resonant cavity 2, the third resonant cavity 3, and the fourth resonant cavity 8.
- the first resonant cavity 1 and the fourth resonant cavity 8 are capacitively coupled. Since the signals in the two paths are opposite in phase, the signals in the two paths cancel each other, thereby generating Low-end zero suppression of bandpass.
- the purpose of adjusting the low-end zero position of the dielectric filter can also be achieved by adjusting the diameter of the through hole 6 and the width of the first blocking ring 7.
- the shape of the through hole 6 in the dielectric filter of the embodiment of the present application may be designed according to actual needs, for example, may be designed as a circular through hole 6 or as a polygonal through hole 6 in which a circular through hole is designed.
- Hole 6 is simpler to process; it is designed as a polygonal through hole 6, and may be, for example, a triangular through hole 6, a rectangular through hole 6, a pentagon through hole 6, and a hexagonal through hole 6, and the like.
- a first barrier ring 7 is provided on one open side of the through hole 6, and in an alternative embodiment, a first one may be provided on both open sides of the through hole 6. Breaking ring 7.
- the medium filter of the embodiment of the present application can be applied to a transceiver device, for example, can be applied in a base station.
- the dielectric filter shown in FIG. 9 is further provided with a signal input end and a signal output end, wherein the signal input end and the signal output end are disposed on the dielectric filter in the same manner as the embodiment. ,No longer.
- FIG. 12 is a schematic structural diagram of still another dielectric filter according to an embodiment of the present application.
- the dielectric filter includes a dielectric block covering the metal layer, wherein the metal layer covering the surface of the dielectric block in FIG. 12 is not identified, and for the structure shown in FIG. 12, unless otherwise specified, Each surface of the structure shown in Fig. 12 is covered with a metal layer. In the following description of the structure of Fig. 12, only the portion not covering the metal layer will be specifically described.
- a slot is provided in the dielectric block shown in FIG. 12, and the dielectric block is divided into a plurality of resonant cavities by slotting. As shown in FIG. 12, four first slots 4 and one second slot 5 are disposed on the dielectric block, and the dielectric blocks are separated into first to sixth by four first slots 4 and one second slot 5. Resonant cavity 11.
- a first path (solid line identification): a signal path of the first resonant cavity 1 - the second resonant cavity 2 - the third resonant cavity 3 - the fourth resonant cavity 8 - the fifth resonant cavity 10 - the sixth resonant cavity 11;
- adjacent resonant cavities form an inductive coupling between the adjacent resonant cavities
- the coupling between the second resonant cavity 2 and the fifth resonant cavity 10 in the second via is inductively coupled
- the signals in the paths have the same phase, and the signals are superimposed in phase without generating a zero point; when the coupling between the second cavity 5 and the fifth cavity 10 is capacitively coupled in the second path, the signals in the two paths are opposite in phase. The signals of the two paths are cancelled, and a zero point can be generated.
- the combined structure of the through hole 6 and the partition ring forms a capacitive coupling between the first resonant cavity 1 and the third resonant cavity 3, and the equivalent circuit is a capacitive component.
- the purpose of adjusting the low-end zero position of the dielectric filter can also be achieved by adjusting the diameter of the through hole 6 and the width of the first blocking ring 7.
- the purpose of adjusting the low-end zero position of the dielectric filter can also be achieved by adjusting the diameter of the through hole 6 and the width of the first blocking ring 7.
- the shape of the through hole 6 in the dielectric filter of the embodiment of the present application may be designed according to actual needs, for example, may be designed as a circular through hole 6 or as a polygonal through hole 6 in which a circular through hole is designed.
- the hole 6 is simpler to machine; it is designed as a polygonal through hole 6, and may be, for example, a triangular through hole 6, a rectangular through hole 6, a pentagon through hole 6, and a hexagonal through hole 6, and the like.
- a first barrier ring 7 is provided on one open side of the through hole 6, and in an alternative embodiment, a first one may be provided on both open sides of the through hole 6. Breaking ring 7.
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Abstract
Description
Claims (10)
- 一种介质滤波器,其特征在于,包括:表面覆盖金属层的介质块,所述介质块包括至少两个谐振腔;所述介质块上有通孔,所述通孔位于相邻的两个谐振腔之间,所述通孔的内壁覆盖有金属层;所述介质块表面上围绕所述通孔的至少一个开口有第一隔断环,所述第一隔断环的内边沿与所述第一隔断环的外边沿所围成的区域暴露出所述介质块。
- 如权利要求1所述的介质滤波器,其特征在于,所述介质块上有开槽,所述开槽将所述介质块分隔为至少三个谐振腔,所述开槽的内表面覆盖有金属层。
- 如权利要求1或2所述的介质滤波器,其特征在于,所述第一隔断环的内边沿与所述通孔开口的边沿间隔设置。
- 如权利要求1至3任一项所述的介质滤波器,其特征在于,所述第一隔断环的中心线与所述通孔的轴线重合。
- 如权利要求1至4任一项所述的介质滤波器,其特征在于,所述通孔的两个开口侧均有所述第一隔断环。
- 如权利要求1至5任一项所述的介质滤波器,其特征在于,所述通孔为圆形通孔。
- 如权利要求1至5任一项所述的介质滤波器,其特征在于,所述通孔为多边形通孔。
- 如权利要求1至7任一项所述的介质滤波器,其特征在于,所述介质块上还有第二隔断环;所述第二隔断环的内边沿和外边沿之间暴露出所述介质块;所述第二隔断环的内边沿所围成区域的金属层作为信号输入端或信号输出端。
- 一种收发设备,其特征在于,包括:如权利要求1至8中任一项所述的介质滤波器。
- 一种基站,其特征在于,包括:如权利要求9所述的收发设备。
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
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KR1020197026808A KR102259051B1 (ko) | 2017-02-16 | 2017-02-16 | 유전체 필터, 송수신 장치, 및 기지국 |
CA3053674A CA3053674C (en) | 2017-02-16 | 2017-02-16 | Dielectric filter, transceiver device, and base station |
CN201780086163.8A CN110291681B (zh) | 2017-02-16 | 2017-02-16 | 介质滤波器、收发设备及基站 |
PCT/CN2017/073789 WO2018148905A1 (zh) | 2017-02-16 | 2017-02-16 | 介质滤波器、收发设备及基站 |
CN202111210399.2A CN113991267B (zh) | 2017-02-16 | 2017-02-16 | 介质滤波器、收发设备及基站 |
EP17896528.1A EP3576218B1 (en) | 2017-02-16 | 2017-02-16 | Dielectric filter, transceiver device, and base station |
US16/542,992 US11139546B2 (en) | 2017-02-16 | 2019-08-16 | Dielectric filter, transceiver device, and base station |
US17/492,124 US11664564B2 (en) | 2017-02-16 | 2021-10-01 | Dielectric filter, transceiver device, and base station |
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PCT/CN2017/073789 WO2018148905A1 (zh) | 2017-02-16 | 2017-02-16 | 介质滤波器、收发设备及基站 |
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US16/542,992 Continuation US11139546B2 (en) | 2017-02-16 | 2019-08-16 | Dielectric filter, transceiver device, and base station |
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US (2) | US11139546B2 (zh) |
EP (1) | EP3576218B1 (zh) |
KR (1) | KR102259051B1 (zh) |
CN (2) | CN110291681B (zh) |
CA (1) | CA3053674C (zh) |
WO (1) | WO2018148905A1 (zh) |
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WO2020228198A1 (zh) * | 2019-05-14 | 2020-11-19 | 京信通信技术(广州)有限公司 | 介质波导滤波器及其容性耦合结构 |
WO2020252946A1 (zh) * | 2019-06-20 | 2020-12-24 | 京信通信技术(广州)有限公司 | 介质波导滤波器的容性耦合结构及介质波导滤波器 |
JP2021002779A (ja) * | 2019-06-21 | 2021-01-07 | Agc株式会社 | 導波管フィルタ |
WO2021077505A1 (zh) * | 2019-10-25 | 2021-04-29 | 京信通信技术(广州)有限公司 | 通信装置、介质波导滤波器及其容性耦合带宽调节方法 |
WO2021135904A1 (zh) * | 2019-12-31 | 2021-07-08 | 江苏灿勤科技股份有限公司 | 一种介质滤波器、具有其的无线电收发设备及基站 |
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EP3576218B1 (en) | 2022-09-07 |
KR20190112151A (ko) | 2019-10-02 |
EP3576218A1 (en) | 2019-12-04 |
CA3053674A1 (en) | 2018-08-23 |
US11664564B2 (en) | 2023-05-30 |
CN113991267B (zh) | 2022-12-06 |
CA3053674C (en) | 2022-11-08 |
CN113991267A (zh) | 2022-01-28 |
KR102259051B1 (ko) | 2021-05-31 |
CN110291681B (zh) | 2021-10-22 |
US11139546B2 (en) | 2021-10-05 |
US20220021095A1 (en) | 2022-01-20 |
CN110291681A (zh) | 2019-09-27 |
US20190372189A1 (en) | 2019-12-05 |
EP3576218A4 (en) | 2020-02-26 |
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